We kicked off the new year with a new unit is science: mixtures and solutions. The first lab involved creating mixtures of water and diatomaceous earth, water and gravel, and water and sodium chloride. After discussing mixtures, students were given the task to separate them. The gravel was separated with a simple screen. The diatomaceous earth required a filter, and the sodium chloride was soon learned to be a special mixture called a solution. None of the tools worked. Today students brainstormed how they may separate the sodium chloride from the water, as the salt had totally dissolved. We are trying evaporation. Some students think it will work while others are not so sure.
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